Expansible mandrel

Details Expansible mandrel Expansible mandrel

1974-06-20

1976-02-24

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Rod or tubular preform

425403, 249180, 249184, B29C 1700, B29D 2300

Patent

active

039402274

ABSTRACT:
In an expansible core, a plurality of first plate segments are moved radially outwardly by means of a conical portion on an operating rod which is moved axially along the longitudinal axis of the core. A plurality of second plate segments are moved axially by the operating rod into the plane of the first plate segments and then expanded outwardly into the spaces between the first plate segments. First and second retraction means are also provided on the operating rod and are engageable respectively with the first and second plate segments to retract the plate segments from their expanded positions upon axial movement of the operating rod in the other direction.

REFERENCES:
patent: 2315634 (1943-04-01), McCall
patent: 2507924 (1950-05-01), Morse
patent: 3339242 (1967-09-01), Lamb
patent: 3482815 (1969-12-01), Naturale
patent: 3677684 (1972-07-01), Platz
patent: 3704978 (1972-12-01), Leier et al.
patent: 3749543 (1973-07-01), Stansbury

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